64 lines
2.3 KiB
C#
64 lines
2.3 KiB
C#
// This file is part of YamlDotNet - A .NET library for YAML.
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// Copyright (c) Antoine Aubry and contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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using System;
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using YamlDotNet.Core;
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using YamlDotNet.Core.Events;
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namespace YamlDotNet.Serialization.NodeDeserializers
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{
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public sealed class NullNodeDeserializer : INodeDeserializer
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{
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bool INodeDeserializer.Deserialize(IParser parser, Type expectedType, Func<IParser, Type, object?> nestedObjectDeserializer, out object? value)
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{
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value = null;
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if (parser.Accept<NodeEvent>(out var evt))
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{
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if (NodeIsNull(evt))
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{
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parser.SkipThisAndNestedEvents();
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return true;
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}
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}
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return false;
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}
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private bool NodeIsNull(NodeEvent nodeEvent)
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{
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// http://yaml.org/type/null.html
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if (nodeEvent.Tag == "tag:yaml.org,2002:null")
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{
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return true;
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}
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if (nodeEvent is Scalar scalar && scalar.Style == Core.ScalarStyle.Plain)
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{
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var value = scalar.Value;
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return value == "" || value == "~" || value == "null" || value == "Null" || value == "NULL";
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}
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return false;
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}
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}
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}
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